I'm looking after a female Hamster (adopted from P@H) so the age is uncertain but I think she's about 1yr. She lives in the top layer of a 6ftx2.5ft hutch. She has a deep layer of shavings to dig, a wheel, tubes to run around in and shes often found climbing the bars. She has free range of this area from 6am through to about 10pm. At night she's shut into her tank - we have cats on the prowl. Over the past few nights she hasn't been so active tending to sleep alot more in her toilet. She's still eating and I havent noticed any lumps that might be suspiscious. Do I need to be overly concerned, is it possible that she's just slowing down with age or is a visit to the vets needed. ? I have weighed her and her weight has remained constant. Thanks.